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<li class="navelem"><a class="el" href="dir_23fbec4e7c966aae2efbb90aeb47f596.html">session</a></li><li class="navelem"><a class="el" href="dir_49621dcf2e58f6d541462f9bec53bd7e.html">shm</a></li><li class="navelem"><a class="el" href="dir_aa9b1de9a811fc0081d5a436dbc37c19.html">classic</a></li>  </ul>
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  <div class="headertitle"><div class="title">session.hpp</div></div>
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<a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Shared Memory</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="shm_2classic_2classic_8hpp.html">ipc/shm/classic/classic.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="stateless__allocator_8hpp.html">ipc/shm/stl/stateless_allocator.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1session_1_1shm_1_1classic.html">ipc::session::shm::classic</a></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>{</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment"></span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">/**</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * Implements the SHM-related API common to shm::classic::Server_session and shm::classic::Client_session.</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> * It is, as of this writing, not to be instantiated by itself.  Rather see shm::classic::Server_session (and</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> * shm::classic::Client_session) regarding what to actually instantiate and</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> * further context.  As for the API in Session_mv itself, it is quite critical.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * shm::classic::Server_session doc header explains the background.  Member doc headers formally document</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> * those members given that background.  #Arena doc header is particularly useful.</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> *</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> * @tparam Session_t</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> *         Class for us to `public`ly sub-class: `Server_session_mv&lt;...&gt;` or `Client_session_mv&lt;...&gt;`.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> *         Note its `public` API is inherited.  See the relevant class template&#39;s doc header.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> */</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Session_t&gt;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html">   42</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html">Session_mv</a> :</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>  <span class="keyword">public</span> <a class="code hl_class" href="classSession__t.html">Session_t</a></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>{</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"></span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment">  /// Short-hand for our base class.  To the user: note its `public` API is inherited.</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#ac11498f4b8a526f2525de8e3d2dcf08c">   49</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classSession__t.html">Base</a> = <a class="code hl_class" href="classSession__t.html">Session_t</a>;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"></span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">   * The arena object on which one may call `construct&lt;T&gt;(ctor_args...)`, where `ctor_args` are arguments</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * to the `T::T()` constructor.  See shm::classic::Pool_arena class doc header for discussion on appropriate</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   * properties of `T`.  Short version for convenience: PODs work; STL nested container+POD combos work, as long as</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * a shm::stl allocator is used at all levels; manually-implemented non-STL-compliant data</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * structures work if care is taken to use `Arena::allocate()` and `Arena::Pointer`.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   *</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   * Suppose `A-&gt;construct()` yields handle `h`, where `A` is any `Arena*` returned by a `*this` accessor --</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment">   * `this-&gt;app_shm()`, `this-&gt;session_shm()`.  Then `h` can be passed to `this-&gt;lend_object()` which yields `Blob b`.</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment">   * Further, an `h` returned by `s-&gt;borrow_object(b)`, executed on the opposing `shm::classic::Session_mv s` (after</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">   * receiving `b` via IPC) shall point to the same location in `A` and will become part of a cross-process</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">   * `shared_ptr` group with the original `h` (and any copies/moves thereof), `*h` garbage-collected based on a</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">   * (conceptual) cross-process ref-count.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">   *</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment">   * Full #Arena capabilities are described in the documentation for the alias&#39;s target, shm::classic::Pool_arena.</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">   * However it is recommended to use borrow_object() and lend_object() on `*this` Session impl as opposed to the</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment">   * #Arena.  There are 2 advantages to this:</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment">   *   - It is easier: it works regardless of which `*this`-originated #Arena the handle originated (via</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment">   *     `construct&lt;&gt;()`).</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment">   *   - It is more generic: other SHM-provider-wrapping Session impls (as of this writing</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">   *     session::shm::arena_lend::jemalloc::Session_mv and its sub-classes `Server_session` and `Client_session`)</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">   *     features the same borrow_object() and lend_object() APIs; hence templated code can be written generically</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">   *     around this.  The same does not hold if one accesses these features via the &quot;native&quot; #Arena API: e.g., the</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment">   *     SHM-classic #Arena has `borrow_object()` and `lend_object()`, due to its simple symmetric setup; while the</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment">   *     SHM-jemalloc `Arena` does not; it uses a separate/asymmetric class to access borrowing/lending.</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment">   * @warning borrow_object() from `*this` is compatible only with lend_object() from the same type;</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment">   *          and similarly for `Arena::borrow_object()` and `Arena::lend_object()`; attempting to mix the APIs for the</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment">   *          same `Blob` will yield undefined behavior.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment">   *</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment">   * @see Contrasting type pair arena_lend::jemalloc::Session_mv::Arena, arena_lend::jemalloc::Session_mv::Shm_session.</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment">   */</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a07c9b1803567c2714ae48433e756047f">   82</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a07c9b1803567c2714ae48433e756047f">Arena</a> = <span class="keyword">typename</span> Base::Base::Impl::Arena;</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"></span> </div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">   * Convenience alias to be used in STL-compliant `T`s with `&quot;Arena::construct&lt;T&gt;()&quot;`, our own lend_object&lt;T&gt;(), and</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment">   * `&quot;Arena::lend_object&lt;T&gt;()&quot;`.  With SHM-classic it may also be used on the borrower side</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment">   * with borrow_object&lt;T&gt;() and `&quot;Arena::borrow_object&lt;T&gt;()&quot;`.</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment">   *</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment">   * @see #Borrower_allocator and contrasting type pair arena_lend::jemalloc::Session_mv::Allocator,</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment">   *      arena_lend::jemalloc::Session_mv::Borrower_allocator.</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">   *</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">   * @tparam T</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">   *         See standard C++ `Allocator` concept.</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">   */</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aeb1fceac476bc8bd159710b7d01f0fe3">   96</a></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1shm_1_1stl_1_1Stateless__allocator.html">Allocator</a> = <a class="code hl_class" href="classipc_1_1shm_1_1stl_1_1Stateless__allocator.html">ipc::shm::stl::Stateless_allocator&lt;T, Arena&gt;</a>;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"></span> </div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   * Equals #Allocator; provided for generic programming for algorithms that would use classic::Session_mv</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   * interchangeably with shm::arena_lend::jemalloc::Session_mv.  Can be used in STL-compliant `T`s with</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   * borrow_object&lt;T&gt;() and `&quot;Arena::borrow_object&lt;T&gt;()&quot;`.</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   *</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * @tparam T</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   *         See standard C++ `Allocator` concept.</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   */</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aecfab9c96933a832be7d2ad91be33532">  107</a></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1shm_1_1stl_1_1Stateless__allocator.html">Borrower_allocator</a></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>    = <a class="code hl_class" href="classipc_1_1shm_1_1stl_1_1Stateless__allocator.html">ipc::shm::stl::Stateless_allocator&lt;T, ipc::shm::Arena_to_borrower_allocator_arena_t&lt;Arena&gt;</a>&gt;;</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment"></span> </div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   * Implements Session API per contract.</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * @see Session::Structured_channel: implemented concept.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   */</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Message_body&gt;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a96f6b597be7cc29f9207df909a4816c4">  115</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a96f6b597be7cc29f9207df909a4816c4">Structured_channel</a></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>    = <span class="keyword">typename</span> <a class="code hl_class" href="classipc_1_1transport_1_1struc_1_1Channel.html">transport::struc::shm::classic::Channel</a>&lt;<span class="keyword">typename</span> Base::Base::Impl::Session_base_obj::Channel_obj,</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>                                                       Message_body&gt;;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment"></span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   * Implements Session API per contract.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span><span class="comment">   * @see Session::Structured_msg_builder_config: implemented concept.</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment">   */</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a23d60bbc945c72cd6f19fdadd7ce014d">  123</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a23d60bbc945c72cd6f19fdadd7ce014d">Structured_msg_builder_config</a> = <span class="keyword">typename</span> Base::Base::Impl::Structured_msg_builder_config;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment"></span> </div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   * Implements Session API per contract.</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * @see Session::Structured_msg_reader_config: implemented concept.</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   */</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a2b27e91465c5dbdefcb12a6913a9ad4c">  129</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a2b27e91465c5dbdefcb12a6913a9ad4c">Structured_msg_reader_config</a> = <span class="keyword">typename</span> Base::Base::Impl::Structured_msg_reader_config;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment"></span> </div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">  /// Alias for a light-weight blob used in borrow_object() and lend_object().</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">  132</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">Blob</a> = <span class="keyword">typename</span> Base::Base::Impl::Blob;</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span> </div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment"></span> </div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">  /// Inherit default, move ctors.</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment"></span>  <span class="keyword">using </span>Base::Base;</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span> </div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment"></span> </div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * Returns SHM #Arena with per-session-scope, meaning it shall be accessible only during the lifetime of</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   * this session, by this Session (via this accessor) and the opposing Session (via its counterpart thereof).</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * See #Arena doc header for useful instructions on working with #Arena, lend_object(), and borrow_object().</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   */</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a07c9b1803567c2714ae48433e756047f">Arena</a>* <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9ff21b10fd753fccfa4882834e677ccf">session_shm</a>();</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment"></span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment">   * Returns SHM #Arena with per-app scope, meaning its pool shall be accessible potentially beyond the lifetime of</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">   * this session but rather until the generating Session_server (i.e., server process) shuts down, by any</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   * Session under that umbrella, now or in the future, as long as its Client_app equals that of `*this` session.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   *</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   * See #Arena doc header for useful instructions on working with #Arena, lend_object(), and borrow_object().</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   *</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * ### If this is the *client*: Lifetime of returned pointed-to `Arena` / underlying SHM areas ###</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   * Long story short (though reading the *server* section just below will provide context/background if needed):</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   *   - `this-&gt;app_shm()` always returns `&amp;A`, where `A` is an #Arena.  No other object returns the same</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   *     `&amp;A`.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   *   -`A` can be accessed until `*this` session is destroyed.  It is impromper (behavior undefined), for code</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   *     in this process, to access any objects residing in SHM areas `A` past that point.</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   *</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">   * To expand somewhat: A `Client_session` dies for one of two reasons if used properly.  One, locally triggered:</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   * this process is done with IPC (usually planning to terminate gracefully).  In this case it&#39;s moot:</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   * if it&#39;s done with IPC, it&#39;s done with SHM in this context.  Two, triggered by opposing side</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * (`Server_session`).  That means *that* process is done with IPC (probably planning to terminate gracefully).</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * In that case it&#39;s also moot: per-app-scope, or any scope maintained by ipc::session, does not (by definition)</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * outlive the `Session_server`; and `Session_server` dying is the standard cause of a `Server_session`</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * being destroyed from a server-local trigger.</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   *</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   * In other words: from a *client* point of view, app_shm() and session_shm() are not qualitatively different;</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   * they both exist and are mutually segregated, but that&#39;s it.  Their lifetimes in a given *client* are the same.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   * Crucially, however, the opposing (*server*) side can make use of the larger lifetime of the underlying arena.</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   * Read on for details:</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   *</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * ### If this is the *server*: Lifetime of returned pointed-to `Arena` / underlying SHM areas ###</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   * (This is subtler than it may appear particularly if one has not worked with SHM pool handles a whole lot.)</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   *</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   * (#Arena, as of this writing at least, is not copyable.  If it becomes copyable then one can &quot;cheat&quot; the below</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">   * setup by making a copy of the deref of the returned #Arena pointer.  However let us assume good will.)</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   *</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span><span class="comment">   * We specify above that the lifetime of the underlying pool goes beyond that of `*this` session unlike</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment">   * session_shm().  What does that really mean though?  A couple of things:</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">   *   - Firstly, it is simply *segregated* from the session_shm() arena.  Hence, if (say) a client writes to the</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   *     latter, crashing in the middle of it, then the app_shm() area(s) are not affected and conceivably can</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">   *     be used, so (e.g.) maybe certain application logic need not reset/restart/whatever.</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">   *   - Secondly, there&#39;s the actual *lifetime* implications which we discuss next.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">   *</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">   * The facts: The underlying pool behind session_shm() is *removed* (on server side) once the session ends.</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">   * The app_shm() one, however, is *removed* only once the shm::classic::Session_server goes down (even in case</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">   * of abrupt termination of its process, the ipc::session machinery will do the removal ASAP on restart;</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   * but we digress; basically its lifetime extends to the end of the &quot;parent&quot; server&#39;s).</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   *</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * It is not quite as simple as that, though.  The actual RAM is given-back to the OS only once (1) the</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * aforementioned *removal* has occured; *and* (2) every #Arena in every process that is open w/r/t that</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   * same pool has been destroyed (even if its dtor does not run due to abrupt exit, OS will clean it up;</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   * but again we digress; just think of it as destroyed via `Arena::~Arena()`).  That is: Each #Arena</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   * is a pool *handle*, and they are tracked by the OS in ref-count fashion cross-process; once they all go away,</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   * then the removal takes place.  Until then any still-existing #Arena is perfectly functional, as if nothing</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   * happened.</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   *</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   * So, actually, while the lifetime of the underlying shared RAM is indeed managed by ipc::session to</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   * equal that of the parent shm::classic::Session_server, that lifetime can *also* be further extended by the</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">   * mere existence of extant #Arena objects in any process.  Given that, here are more facts:</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">   *   - `this-&gt;app_shm()` always returns `&amp;A`, where `A` is an #Arena.</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">   *     In fact it returns `X.app_shm(C)`, where `C` is the Client_app pertaining to `*this`, and</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">   *     `X` is the shm::classic::Server_session whose shm::classic::Session_server::async_accept() loaded `*this`.</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">   *     shm::classic::Session_server::app_shm() doc header states that it always returns the same non-null value</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">   *     until `X`&#39;s destruction.</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   *     - Thus `Y.app_shm()` (where `Y` is any shm::classic::Server_session coming from the same `X`,</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">   *       and with the same Server_session_mv::client_app()) also always returns `&amp;A`,</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">   *       and the `A` is that very same #Arena again.</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment">   *   -`A` can be accessed until the server object `X` (whose `X.async_accept()` yielded the contents of `*this`)</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">   *     is destroyed.  It is impromper (behavior undefined) for code in this process to access any objects</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">   *     residing in SHM areas `A` past that point.</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   *     - However, crucially, it is both proper and intended that `A` (along with objects residing therein) is used</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   *       across 1+ `shm::classic::Server_session`s sharing the same Client_app, all the way up to the death</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   *       of the parent `Session_server`.</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">   *</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">   * To be clear (for a given Client_app) it doesn&#39;t matter which session object&#39;s app_shm() one uses; it&#39;s</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">   * always the same pointer to the same object living inside shm::classic::Session_server.  One can also use</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">   * shm::classic::Session_server::app_shm() directly, if that is more convenient, although as of this writing</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">   * the present app_shm() is somewhat faster, returning a directly-cached pointer instead of performing</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   * a mutex-protected map lookup (internally).</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">   *</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">   * #Arena is not copyable; hence there is no way to extend the lifetime of the underlying SHM areas beyond that.</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">   *</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">   */</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a07c9b1803567c2714ae48433e756047f">Arena</a>* <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#ac6a4f1fbafb583f37d7586c6a199430f">app_shm</a>();</div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment"></span> </div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">   * Adds an owner process to the owner set of the given `session_shm-&gt;construct()`- or `app_shm()-&gt;construct()`-created</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span><span class="comment">   * handle, and returns an opaque blob, such that if one passes it to opposing Session_mv::borrow_object() in the</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="comment">   * receiving process, that `borrow_object()` shall return an equivalent `Handle` in that process.  The returned `Blob`</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="comment">   * is guaranteed to have non-zero size that is small enough to be considered very cheap to copy and hence</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span><span class="comment">   * transmit over IPC.</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span><span class="comment">   *</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="comment">   * It is the user&#39;s responsibility to transmit the returned blob, such as via a transport::Channel,</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span><span class="comment">   * to the owning process.  Failing to do so will leak the object until arena cleanup.  (Arena cleanup time</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment">   * depends on the source #Arena.  If it came from session_shm(), arena cleanup occurs at Session destruction.</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">   * If from app_shm(), arena cleanup occurs at Server_session destruction.  If a destructor does not run, due to</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">   * crash/etc., then the leaked ipc::session-managed `Arena`s&#39; pools are cleaned the next time a Session_server</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">   * is constructed.)</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">   *</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   * ### What it really does ###</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">   * Omitting certain internal details, it determines which #Arena (of session_shm() or app_shm())</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">   * `handle` originated; and then calls `A-&gt;lend_object(handle)` on that guy and returns that.  I mention this for</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">   * context; it is arguably desirable to not count on these details in code that can generically work with</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">   * a different SHM-enabled Session, such as shm::arena_lend::jemalloc::Session_mv, taken as a template param.</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">   * E.g., shm::arena_lend::jemalloc::Server_session::lend_object() does not, and cannot (as it does not exist), call</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">   * any `Arena::lend_object()`.</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span><span class="comment">   *</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span><span class="comment">   * However, if your code specifically counts on `*this` being a shm::classic::Server_session, then it is not wrong</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment">   * to rely on this knowledge.</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">   *</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span><span class="comment">   * @tparam T</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span><span class="comment">   *         See #Arena.</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment">   * @param handle</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">   *        Value returned by `session_shm()-&gt;construct&lt;T&gt;()` or `app_shm()-&gt;construct&lt;T&gt;()`; or</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">   *        copied/moved therefrom.  Note this is a mere `shared_ptr&lt;T&gt;` albeit with unspecified custom deleter</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">   *        logic attached.</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">   * @return See above.  Never `.empty()`.</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">   */</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">Blob</a> <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a794f83a8111428b3b1feec7216f692dd">lend_object</a>(<span class="keyword">const</span> <span class="keyword">typename</span> Arena::template Handle&lt;T&gt;&amp; handle);</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment"></span> </div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="comment">   * Completes the cross-process operation begun by oppsing Session_mv::lend_object() that returned `serialization`;</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span><span class="comment">   * to be invoked in the intended new owner process which is operating `*this`.</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment">   *</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">   * @tparam T</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span><span class="comment">   *         See lend_object().</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span><span class="comment">   * @param serialization</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment">   *        Value, not `.empty()`, returned by opposing lend_object(), or by opposing `Arena::lend_object()`, and</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment">   *        transmitted bit-for-bit to this process.</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">   * @return See above.  Never null.</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">   */</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>  <span class="keyword">typename</span> Arena::template Handle&lt;T&gt; <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a4223fc944735adb6946a9d1938d06a20">borrow_object</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">Blob</a>&amp; serialization);</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment"></span> </div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment">   * Returns builder config suitable for capnp-serializing out-messages in SHM arena session_shm().</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="comment">   */</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a23d60bbc945c72cd6f19fdadd7ce014d">Structured_msg_builder_config</a> <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a85bb0b948b7b54c06557edd3d03d66bd">session_shm_builder_config</a>();</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment"></span> </div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   * When transmitting items originating in #Arena session_shm() via</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   * transport::struc::shm::Builder::emit_serialization() (and/or transport::struc::Channel send facilities), returns</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   * additional-to-payload information necessary to target the opposing process properly.</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   *</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="comment">   * Internally: Since `*this` type is based on the arena-sharing SHM-provider type (SHM-classic), this is simply</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment">   * session_shm() itself.  Generic code of yours should not need to rely on that impl detail, but we mention it</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span><span class="comment">   * for education/context.</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span><span class="comment">   *</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span><span class="comment">   */</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span>  <span class="keyword">typename</span> Structured_msg_builder_config::Builder::Session <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3af67219e611f450402824e5b8b162d6">session_shm_lender_session</a>();</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span><span class="comment"></span> </div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">   * Returns reader config counterpart to the opposing `Session::session_shm_builder_config()` and</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span><span class="comment">   * `Session::session_shm_lender_session()`.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span><span class="comment">   *</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span><span class="comment">   */</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a2b27e91465c5dbdefcb12a6913a9ad4c">Structured_msg_reader_config</a> <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9e73c65e57a4de3811613763da3c628b">session_shm_reader_config</a>();</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="comment"></span> </div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment">   * Identical to session_shm_builder_config() but backed by SHM arena app_shm() instead of session_shm().</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   */</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a23d60bbc945c72cd6f19fdadd7ce014d">Structured_msg_builder_config</a> <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0fbea0563835e852069cdaab506dd92c">app_shm_builder_config</a>();</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment"></span> </div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span><span class="comment">   * When transmitting items originating in #Arena app_shm() via transport::struc::shm::Builder::emit_serialization()</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="comment">   * (and/or transport::struc::Channel send facilities), returns additional-to-payload information necessary to</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span><span class="comment">   * target the opposing process properly.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span><span class="comment">   *</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment">   */</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span>  <span class="keyword">typename</span> Structured_msg_builder_config::Builder::Session <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0b7540b33fcedeaba37a3fece1bdec7a">app_shm_lender_session</a>();</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span><span class="comment"></span> </div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment">   * Returns reader config counterpart to app_shm_builder_config().</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="comment">   *</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   */</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>  <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a2b27e91465c5dbdefcb12a6913a9ad4c">Structured_msg_reader_config</a> <a class="code hl_function" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aaeeacd92acfefb73ed9af3ef22917f14">app_shm_reader_config</a>();</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>}; <span class="comment">// class Session_mv</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span> </div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span><span class="comment">// Free functions: in *_fwd.hpp.</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span> </div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span><span class="comment"></span> </div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="comment">/// Internally used macro; public API users should disregard (same deal as in struc/channel.hpp).</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"><a class="line" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">  338</a></span><span class="comment"></span><span class="preprocessor">#define TEMPLATE_CLSC_SESSION_MV \</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="preprocessor">  template&lt;typename Session_t&gt;</span><span class="comment"></span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span><span class="comment">/// Internally used macro; public API users should disregard (same deal as in struc/channel.hpp).</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"><a class="line" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a8614aceaa6688e9bc53d56c45b8f548d">  341</a></span><span class="comment"></span><span class="preprocessor">#define CLASS_CLSC_SESSION_MV \</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span><span class="preprocessor">  Session_mv&lt;Session_t&gt;</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span> </div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span><span class="comment">// The rest just continues the pImpl-lite paradigm, same as our public super-class.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span> </div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9ff21b10fd753fccfa4882834e677ccf">  347</a></span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Arena* CLASS_CLSC_SESSION_MV::session_shm()</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>{</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;session_shm();</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span>}</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span> </div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#ac6a4f1fbafb583f37d7586c6a199430f">  354</a></span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Arena* CLASS_CLSC_SESSION_MV::app_shm()</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>{</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;app_shm();</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span>}</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span> </div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Blob</div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a794f83a8111428b3b1feec7216f692dd">  363</a></span>  CLASS_CLSC_SESSION_MV::lend_object(<span class="keyword">const</span> <span class="keyword">typename</span> Arena::template Handle&lt;T&gt;&amp; handle)</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span>{</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;template lend_object&lt;T&gt;(handle);</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span>}</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span> </div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Arena::template Handle&lt;T&gt;</div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a4223fc944735adb6946a9d1938d06a20">  372</a></span>  CLASS_CLSC_SESSION_MV::borrow_object(<span class="keyword">const</span> <a class="code hl_typedef" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">Blob</a>&amp; serialization)</div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span>{</div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;template borrow_object&lt;T&gt;(serialization);</div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span>}</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span> </div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_builder_config</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a85bb0b948b7b54c06557edd3d03d66bd">  380</a></span>  CLASS_CLSC_SESSION_MV::session_shm_builder_config()</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span>{</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;session_shm_builder_config();</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span>}</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span> </div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_builder_config::Builder::Session</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3af67219e611f450402824e5b8b162d6">  388</a></span>  CLASS_CLSC_SESSION_MV::session_shm_lender_session()</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span>{</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;session_shm_lender_session();</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span>}</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span> </div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_reader_config</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9e73c65e57a4de3811613763da3c628b">  396</a></span>  CLASS_CLSC_SESSION_MV::session_shm_reader_config()</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>{</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;session_shm_reader_config();</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>}</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span> </div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_builder_config</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0fbea0563835e852069cdaab506dd92c">  404</a></span>  CLASS_CLSC_SESSION_MV::app_shm_builder_config()</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>{</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;app_shm_builder_config();</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>}</div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span> </div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_builder_config::Builder::Session</div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0b7540b33fcedeaba37a3fece1bdec7a">  412</a></span>  CLASS_CLSC_SESSION_MV::app_shm_lender_session()</div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span>{</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;app_shm_lender_session();</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span>}</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span> </div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span><span class="keyword">typename</span> CLASS_CLSC_SESSION_MV::Structured_msg_reader_config</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aaeeacd92acfefb73ed9af3ef22917f14">  420</a></span>  CLASS_CLSC_SESSION_MV::app_shm_reader_config()</div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>{</div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>  assert(Base::Base::impl() &amp;&amp; <span class="stringliteral">&quot;Do not call this on as-if-default-cted Session.&quot;</span>);</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span>  <span class="keywordflow">return</span> Base::Base::impl()-&gt;app_shm_reader_config();</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>}</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span> </div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span><a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"><a class="line" href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aea882d38a00f81a98d6604e300c5a01a">  427</a></span>std::ostream&amp; <a class="code hl_function" href="namespaceipc_1_1session_1_1shm_1_1classic.html#ae28750f5d14a8ec78ea4d5310e212482">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code hl_define" href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a8614aceaa6688e9bc53d56c45b8f548d">CLASS_CLSC_SESSION_MV</a>&amp; val)</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>{</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>  <span class="keywordflow">return</span> os &lt;&lt; static_cast&lt;const typename CLASS_CLSC_SESSION_MV::Base::Base&amp;&gt;(val);</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>}</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span> </div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span><span class="preprocessor">#undef CLASS_CLSC_SESSION_MV</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span><span class="preprocessor">#undef TEMPLATE_CLSC_SESSION_MV</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span> </div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>} <span class="comment">// namespace ipc::session::shm::classic</span></div>
<div class="ttc" id="aclassSession__t_html"><div class="ttname"><a href="classSession__t.html">Session_t</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html">ipc::session::shm::classic::Session_mv</a></div><div class="ttdoc">Implements the SHM-related API common to shm::classic::Server_session and shm::classic::Client_sessio...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00042">session.hpp:44</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a07c9b1803567c2714ae48433e756047f"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a07c9b1803567c2714ae48433e756047f">ipc::session::shm::classic::Session_mv::Arena</a></div><div class="ttdeci">typename Base::Base::Impl::Arena Arena</div><div class="ttdoc">The arena object on which one may call construct&lt;T&gt;(ctor_args...), where ctor_args are arguments to t...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00082">session.hpp:82</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a0b7540b33fcedeaba37a3fece1bdec7a"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0b7540b33fcedeaba37a3fece1bdec7a">ipc::session::shm::classic::Session_mv::app_shm_lender_session</a></div><div class="ttdeci">Structured_msg_builder_config::Builder::Session app_shm_lender_session()</div><div class="ttdoc">When transmitting items originating in Arena app_shm() via transport::struc::shm::Builder::emit_seria...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00412">session.hpp:412</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a0fbea0563835e852069cdaab506dd92c"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a0fbea0563835e852069cdaab506dd92c">ipc::session::shm::classic::Session_mv::app_shm_builder_config</a></div><div class="ttdeci">Structured_msg_builder_config app_shm_builder_config()</div><div class="ttdoc">Identical to session_shm_builder_config() but backed by SHM arena app_shm() instead of session_shm().</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00404">session.hpp:404</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a23d60bbc945c72cd6f19fdadd7ce014d"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a23d60bbc945c72cd6f19fdadd7ce014d">ipc::session::shm::classic::Session_mv::Structured_msg_builder_config</a></div><div class="ttdeci">typename Base::Base::Impl::Structured_msg_builder_config Structured_msg_builder_config</div><div class="ttdoc">Implements Session API per contract.</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00123">session.hpp:123</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a2b27e91465c5dbdefcb12a6913a9ad4c"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a2b27e91465c5dbdefcb12a6913a9ad4c">ipc::session::shm::classic::Session_mv::Structured_msg_reader_config</a></div><div class="ttdeci">typename Base::Base::Impl::Structured_msg_reader_config Structured_msg_reader_config</div><div class="ttdoc">Implements Session API per contract.</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00129">session.hpp:129</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a3af67219e611f450402824e5b8b162d6"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3af67219e611f450402824e5b8b162d6">ipc::session::shm::classic::Session_mv::session_shm_lender_session</a></div><div class="ttdeci">Structured_msg_builder_config::Builder::Session session_shm_lender_session()</div><div class="ttdoc">When transmitting items originating in Arena session_shm() via transport::struc::shm::Builder::emit_s...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00388">session.hpp:388</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a3ca151e694dc819205aff5995c16ba76"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a3ca151e694dc819205aff5995c16ba76">ipc::session::shm::classic::Session_mv::Blob</a></div><div class="ttdeci">typename Base::Base::Impl::Blob Blob</div><div class="ttdoc">Alias for a light-weight blob used in borrow_object() and lend_object().</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00132">session.hpp:132</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a4223fc944735adb6946a9d1938d06a20"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a4223fc944735adb6946a9d1938d06a20">ipc::session::shm::classic::Session_mv::borrow_object</a></div><div class="ttdeci">Arena::template Handle&lt; T &gt; borrow_object(const Blob &amp;serialization)</div><div class="ttdoc">Completes the cross-process operation begun by oppsing Session_mv::lend_object() that returned serial...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00372">session.hpp:372</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a794f83a8111428b3b1feec7216f692dd"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a794f83a8111428b3b1feec7216f692dd">ipc::session::shm::classic::Session_mv::lend_object</a></div><div class="ttdeci">Blob lend_object(const typename Arena::template Handle&lt; T &gt; &amp;handle)</div><div class="ttdoc">Adds an owner process to the owner set of the given session_shm-&gt;construct()- or app_shm()-&gt;construct...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00363">session.hpp:363</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a85bb0b948b7b54c06557edd3d03d66bd"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a85bb0b948b7b54c06557edd3d03d66bd">ipc::session::shm::classic::Session_mv::session_shm_builder_config</a></div><div class="ttdeci">Structured_msg_builder_config session_shm_builder_config()</div><div class="ttdoc">Returns builder config suitable for capnp-serializing out-messages in SHM arena session_shm().</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00380">session.hpp:380</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a96f6b597be7cc29f9207df909a4816c4"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a96f6b597be7cc29f9207df909a4816c4">ipc::session::shm::classic::Session_mv::Structured_channel</a></div><div class="ttdeci">typename transport::struc::shm::classic::Channel&lt; typename Base::Base::Impl::Session_base_obj::Channel_obj, Message_body &gt; Structured_channel</div><div class="ttdoc">Implements Session API per contract.</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00115">session.hpp:117</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a9e73c65e57a4de3811613763da3c628b"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9e73c65e57a4de3811613763da3c628b">ipc::session::shm::classic::Session_mv::session_shm_reader_config</a></div><div class="ttdeci">Structured_msg_reader_config session_shm_reader_config()</div><div class="ttdoc">Returns reader config counterpart to the opposing Session::session_shm_builder_config() and Session::...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00396">session.hpp:396</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_a9ff21b10fd753fccfa4882834e677ccf"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#a9ff21b10fd753fccfa4882834e677ccf">ipc::session::shm::classic::Session_mv::session_shm</a></div><div class="ttdeci">Arena * session_shm()</div><div class="ttdoc">Returns SHM Arena with per-session-scope, meaning it shall be accessible only during the lifetime of ...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00347">session.hpp:347</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_aaeeacd92acfefb73ed9af3ef22917f14"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#aaeeacd92acfefb73ed9af3ef22917f14">ipc::session::shm::classic::Session_mv::app_shm_reader_config</a></div><div class="ttdeci">Structured_msg_reader_config app_shm_reader_config()</div><div class="ttdoc">Returns reader config counterpart to app_shm_builder_config().</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00420">session.hpp:420</a></div></div>
<div class="ttc" id="aclassipc_1_1session_1_1shm_1_1classic_1_1Session__mv_html_ac6a4f1fbafb583f37d7586c6a199430f"><div class="ttname"><a href="classipc_1_1session_1_1shm_1_1classic_1_1Session__mv.html#ac6a4f1fbafb583f37d7586c6a199430f">ipc::session::shm::classic::Session_mv::app_shm</a></div><div class="ttdeci">Arena * app_shm()</div><div class="ttdoc">Returns SHM Arena with per-app scope, meaning its pool shall be accessible potentially beyond the lif...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00354">session.hpp:354</a></div></div>
<div class="ttc" id="aclassipc_1_1shm_1_1stl_1_1Stateless__allocator_html"><div class="ttname"><a href="classipc_1_1shm_1_1stl_1_1Stateless__allocator.html">ipc::shm::stl::Stateless_allocator</a></div><div class="ttdoc">Stateless allocator usable with STL-compliant containers to store (or merely read) them directly in S...</div><div class="ttdef"><b>Definition:</b> <a href="stateless__allocator_8hpp_source.html#l00118">stateless_allocator.hpp:119</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1struc_1_1Channel_html"><div class="ttname"><a href="classipc_1_1transport_1_1struc_1_1Channel.html">ipc::transport::struc::Channel</a></div><div class="ttdoc">Owning and wrapping a pre-connected transport::Channel peer (an endpoint of an established channel ov...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__transport__structured_2src_2ipc_2transport_2struc_2channel_8hpp_source.html#l00580">channel.hpp:583</a></div></div>
<div class="ttc" id="aipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_html_a6244038e46aab51acd25bd9d4958cdb2"><div class="ttname"><a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a6244038e46aab51acd25bd9d4958cdb2">TEMPLATE_CLSC_SESSION_MV</a></div><div class="ttdeci">#define TEMPLATE_CLSC_SESSION_MV</div><div class="ttdoc">Internally used macro; public API users should disregard (same deal as in struc/channel....</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00338">session.hpp:338</a></div></div>
<div class="ttc" id="aipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_html_a8614aceaa6688e9bc53d56c45b8f548d"><div class="ttname"><a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp.html#a8614aceaa6688e9bc53d56c45b8f548d">CLASS_CLSC_SESSION_MV</a></div><div class="ttdeci">#define CLASS_CLSC_SESSION_MV</div><div class="ttdoc">Internally used macro; public API users should disregard (same deal as in struc/channel....</div><div class="ttdef"><b>Definition:</b> <a href="ipc__shm_2src_2ipc_2session_2shm_2classic_2session_8hpp_source.html#l00341">session.hpp:341</a></div></div>
<div class="ttc" id="anamespaceipc_1_1session_1_1shm_1_1classic_html"><div class="ttname"><a href="namespaceipc_1_1session_1_1shm_1_1classic.html">ipc::session::shm::classic</a></div><div class="ttdoc">Support for SHM-backed ipc::session sessions and session-servers with the SHM-classic (ipc::shm::clas...</div><div class="ttdef"><b>Definition:</b> <a href="session_2detail_2shm_2classic_2classic__fwd_8hpp_source.html#l00023">classic_fwd.hpp:24</a></div></div>
<div class="ttc" id="anamespaceipc_1_1session_1_1shm_1_1classic_html_ae28750f5d14a8ec78ea4d5310e212482"><div class="ttname"><a href="namespaceipc_1_1session_1_1shm_1_1classic.html#ae28750f5d14a8ec78ea4d5310e212482">ipc::session::shm::classic::operator&lt;&lt;</a></div><div class="ttdeci">std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Session_impl&lt; Session_impl_t &gt; &amp;val)</div><div class="ttdoc">Prints string representation of the given Session_impl to the given ostream.</div><div class="ttdef"><b>Definition:</b> <a href="src_2ipc_2session_2detail_2shm_2classic_2session__impl_8hpp_source.html#l00412">session_impl.hpp:412</a></div></div>
<div class="ttc" id="ashm_2classic_2classic_8hpp_html"><div class="ttname"><a href="shm_2classic_2classic_8hpp.html">classic.hpp</a></div></div>
<div class="ttc" id="astateless__allocator_8hpp_html"><div class="ttname"><a href="stateless__allocator_8hpp.html">stateless_allocator.hpp</a></div></div>
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